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Employee Benefit Plans (Components of the Net Periodic Pension Plan Cost) (SERP) (Details) - SERP [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 28 $ 26 $ 84 $ 78
Interest cost 76 72 226 216
Amortization of recognized (gain)/ loss 40 37 121 110
Amortization of prior service cost (1) (1) (2) (2)
Net pension expense/(credit) included in employee benefits $ 143 $ 134 $ 429 $ 402